Our SR6 salinity refractometer features a magnified scale for better visual accuracy. Other features include solid aluminum construction, a rubber-gripped body and temperature compensation between 10 and 30ºC (50–86ºF).

To calibrate, simply loosen the handset screw, place a few drops of water on the prism, turn the calibration ring until the shadowline is at zero and secure the set screw—that's it!